Patents by Inventor John E. Allain

John E. Allain has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for drawing lines, curves, and points coincident with a surface
    Patent number: 5379370
    Abstract: A method, for execution by a graphics processing system (10), for rendering objects for display to a viewer upon a display (20) having a plurality of display pixels. The method includes the steps of, for a surface to be displayed having a surface marking coincident therewith, (a) moving the surface marking towards the viewer or, alternatively, moving the surface away from the viewer, by an amount that is function of a parameter (S) and also a scale factor (K) that expresses a relationship between viewer eye coordinate units and display pixel units. The parameter (S) determines a maximum slope for the surface, relative to a viewing plane, such that the step of moving will not cause a portion of the surface marking to be obscured by the surface. The step of moving includes a step of (b) applying a predetermined transformation T'.sub.e from a viewer eye coordinate system to a modified viewer eye coordinate system. The predetermined transformation T'.sub.
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: January 3, 1995
    Assignee: International Business Machines Corporation
    Inventors: John E. Allain, Bruce D. Lucas